Geomancy is a form of magic that focuses on control and manipulation of earth and water. It is distinct from Exo-Magic insofar as, like other forms of -Mancy, the control is about manipulation and power-over, as opposed to 'drawing power from' the source.
Perhaps the most famous geomancers are the Ebetans, who reshaped entire regions and eventually destroyed their empire with a massive Earthen Wave.
G.S.S. Geomancer is named for this type of magic.